Biomedical Engineering Exam: Materials Science - Higher Certificate in Engineering, Exams of Materials science

Download Biomedical Engineering Exam: Materials Science - Higher Certificate in Engineering and more Exams Materials science in PDF only on Docsity! Cork Institute of Technology Higher Certificate in Engineering in Biomedical Engineering – Award (NFQ Level 6) Summer 2007 Materials Science (Time: 3 hours) Answer5 Questions Examiner: Mr. M. Walsh All questions carry equal marks Mr. M. Murphy Prof. P. McHugh Q1. (a) Label the parts on the Iron-Carbon equilibrium diagram in fig.1 (b) Explain the cooling transformation of steel at the eutectic composition. (12 marks) (c) Describe full annealing and normalising, explaining why each process is performed and the condition of the material afterwards. (8 marks) Q2. (a) Discuss galvanic corrosion, giving examples of materials involved, include sketches. (8 marks) (b) Write a short note on 2 corrosion resistant metals. (6 marks) (c) Describe 3 methods of producing a protective coating on steel. (6 marks) Q3. (a) Given the following data for a fibre-glass reinforced polyester component of rectangular cross-section in which the strands lie parallel to the direction of loading, calculate: i) the matrix area fraction and the reinforcement area fraction ii) the tensile modulus of the composite iii) the tensile strength of the composite average fibre diameter 0.005mm number of fibres per strand 204 number of strands 51470 tensile modulus of polyester 4 GN/M2 tensile modulus for glass fibre 75GN/M2 tensile strength of polyester 50MN/M2 tensile strength of glass fibre 1500 MN/M2 Cross-sectional area of component 300mm2 (12 marks) (b) Show using sketches the effect of the direction of the grain on the strength of wood. (8 marks) Q4. (a) Give examples of properties and applications for: i) Thermosetting Plastics ii) Thermo Plastics iii) Elastomers (8 marks) (b) Give a brief description of 3 additives with regard to polymeric materials. (6 marks) (c) Discuss Tensile testing of polymers, include sketches. What is the Secant Modulus. (6 marks)